Another portrait I painted thanks to a real model.
This time I had the opportunity to "directly" work with him : he spent 6+2 hs in my studio and I must admit that it's an amazing sensation to work with a tablet and a monitor like with real colors on a canvas.
This time the goal was a realistic representation of his face. To obtain it I used a lot of tricks. The first one is the "double window" under photoshop. With this option you can look at 2 windows showing the same pic but with a different zoom. It's very useful to see how the whole image appears with the colors you are applying locally. This helps a lot especially in main-volumes definition.
The second one is the use of a simple greyscale : I don't know why but I find more easy to work only with greys and do not manage all hues during the starting steps. So how to pass from greyscale to colors? Well, put a layer in overlay mode and apply your colors on it, then merge all and start to paint your details and manage it as a normal layer.
The third and last one is curve manipulation under ps. I find it very useful to enhance the 3D effect and manage the little lighting-errors.
As I wrote I used these tricks under ps but all the "pure-painting" process has been done under painter cause I feel better painting at it
These are few image-steps.

Be patient, it was my first time with a live model here in my studio, I had no saving-method to show you more steps. I hope I'll be able to produce a better documentation next time.